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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52ab64fb7a7f9ba89df47c29a0ca29753c70f0413ec5497a3a6258534595de0' 
  AND token = 'mL5r/wSsI2y9E00dqYHmqGtBVbLAR9M5Afk04v7VIto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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