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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63720f40d4028fc12dac12ba3acb42ce81cea60be87fec7d64514d0abb608348' 
  AND token = 'zxCC+b+7CggEoY16dsm3ewpnIJWlAHa0/BiMyKAvoHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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