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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9d974eaf46d5a99b15512714e77e2f13ecc74e61199334d3db7236191a3488' 
  AND token = 'IWclzdDO1kBn0h7jFGWCY7yONGnyKw8VMqUyXfL7W+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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