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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ecd6abb7dee539cccb660c4931464fe8fef88ccf12011967d66f1b5a6b66f8' 
  AND token = 'zbFaAXFI/NYxC7rh3xn6qWwS8M9gF+cJ6orl1xCuMro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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