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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03fd3c5f34e76ca4d7ff68b0d35df1c1d149e9ad8782fc3825ad214a703fc3f' 
  AND token = 'pn/psErlX9XFIxjfHFi9bStI0teAeZRb0vEQjFEmXnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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