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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a2c55ce3b51bd0ada8fb5ebc98981dec257029b4bfb47a8d2bf7a7a5c885c4' 
  AND token = 'YYkdn0LOKEU6G6a9tKhESg5llFRrOWBYdKRHbCrJZ7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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