SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a939ebc71b90e93a786e4d68050332f58277e5aa7172a51a24384fdbd449ec' 
  AND token = 'eHg6Tf5g4iRqV6TYJTDqBzzCSJ/MuwA773XuV8Wz5gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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