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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f13f4291f102a6ca46d962100008baac8d1581478c474b17d83762bc1cefd6b' 
  AND token = 'TJzJ2+109TXxowOV5A0n7Ur3rsl6sOge5ydDvlCLaWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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