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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971000c63243b77e48f0d4ba16188f2e2c02e758f570425c2f7bb7c4db1ca218' 
  AND token = 'cWXFF8wkggFI9PWrwNMw4ODF2XiBw1SThdcniD9f7DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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