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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5eb68e3181061be9d2aa59b79ea707d78e774360f3d009dd329c13157fe5e69' 
  AND token = 'CTr6htfeO14jG88xn8Cw38e4pB2V2mFdPQuMuZ1dPDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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