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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c467bc30d5dc00d5a513e976ffc564b9646ef3441141822038ee0be3fc27cc4f' 
  AND token = 'C9Jcj/D9A8+yJx+jDqdRpq8YDZNNv5NTFJpu75FoJow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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