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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db36654c22481c46633c3cde73a146cc975acab48176dac050c45bd6fecc6850' 
  AND token = 'R5KT4PUnWWe+21G51I3F5gzHtqf5jPeXZc4p/Q14lQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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