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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775188e1b77e377c2eed5af76a5c873a0cb2780a60bafffac94d82d8e5c6e451' 
  AND token = 'lqgNTbLtfAvmLYqxhy7bPy3f2leHMX+mmeJENuunUuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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