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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8bb96985033aafa7cebfd8852dfff3145807c2e53cd43b8ff5fde8bded1104' 
  AND token = 'OcX8G3YpSxmdcQ4+CNH8/Q87l9AbjJHE7sKhknw+Foc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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