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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571e256e6ac11bcfde1d963118edaac7b145f6297e38360f62e6d0e4dcf32a7d' 
  AND token = '7f01Ujws/55SZ5CiWBYNEI8JxdRyJ7OgZe6qz99eI6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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