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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfff0958607a321cac185acbe76e03e3fe953f11097779a7c4d121132773dcf0' 
  AND token = 'qd5T9wYMLTy+rGLlZDVGQCo874NOd9iUX7i6VyC85Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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