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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249013c659faab17d4c72148d6ed5ea2b6a3bf31008a4a27e0d22d5f1ffbdfcc' 
  AND token = 'K1F9R5MuMvlrHr/Co51F4XOvcKh2GMy78E+27oPycEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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