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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ef068c69485d834567c8046df3eb7ed181e3cd83b2b403f1f93446841ccc7c' 
  AND token = 'MLn3lLViWlyHT9Ps9eZVRpu5rT0c0f7hio4AdYlBd6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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