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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbb06a38792a7eb5b92075354e921cb0514aa3dd9e0cd18eef5387e8b328c1f' 
  AND token = 'NarYattP+Op4r7wDPMLq383bRX5nBZdTbg7qXZRwIg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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