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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1b74f37948c9b7a21bc8aa9c35004a295d20b509968cc5c3c2d28a930ddbc0' 
  AND token = 'ca+3UzU3JEY3jRNjeUd8P5CK56Zu5+3k3aMNa38VM+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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