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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd413d50319aa00015df98e6a94eb0cb6b7e6bd1ac32913a8e3822b83b5a5bd6c' 
  AND token = 'C2CmcL+9f41gnyeh04P+OQPscTFcb2xmmJMPAnRXg3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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