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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfe2901c03812c28300b9313fa6a637dae9f74a7f45d814538e9e7ba0fb7669' 
  AND token = '4lEr+XH37muWM5Xm7v6NPF8ZTy/jsHjCU7PW/PUy7bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}