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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22e9eb5972f78435acfb9bc976613461c6145766578e32df71841c4902a600e' 
  AND token = 'uCvGbFdcjWF4qLik5ia5hf+GaV8Mv/VrAxR/RkSMuS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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