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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa2ea92453fde6f06804912b67ba83e8cbba56f1c6488936224d88cf0bef8ee' 
  AND token = 'UxRbMzB3bW4pHznX9hEwPw7dS21QJJqQn73m4ExY40w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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