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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26a487f5867476a85849025345350d4654b19e235b45b76672eb5ca7328b722' 
  AND token = 'z8NL9TwO0eWXYsrvIi7dji8L9R4L6gOw8i+7YKoy5S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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