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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d8d1b1f8b99401400fa3f58e0efb85c7db85eb08cf0cab63aae3ed551d344f' 
  AND token = 'hvwOL6s8CYqaEIl5yiL5iguRYAR9jZAB8D/RUesd+es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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