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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b5a7d6c4736abb7dbe6697a9685d3c321a0df25b1eacee885256dc8641c98c' 
  AND token = 'bWsMjKxFD2HQJ0XTk4gHiq/CglNr27pTL0UJoRmofl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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