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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca346431df3b8559b722577ddf60be3c8d2fc9840b1660b69efcc2a90fd5e8ec' 
  AND token = '4hVModrMwx7tW+db84Zp8khGy9bdAzYDU+8SnL/D178=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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