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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c8b0809d686b29991bc657db4e98ec0751ea1a7cba29ee09a21bb45237f35f' 
  AND token = 'Zz7e2pETWJmLXl427fh/KG+SUIrtel+TopXrfd1nJcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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