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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5dd26df5cc1fb58a80346b4e5017de6bb18e9e741403904fe1d36a44f9d93b' 
  AND token = 'BuWGFD4hi06uhVyDJ0+QQqe2/dbQ6V9aRHThqIc4Gyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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