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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2769680d61883c75df581424268c475e74a3a145139aae7740bb9a2fd9cdc9f' 
  AND token = '+jLJu8RNWtM9fX72UGoS7ElY1vFdGke1jfzpYU9+4gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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