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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043baf7dbce40e3ec161dd81a8fa59b2ecb049e6319f74dd4910ec324288fc68' 
  AND token = 'KU7tkeFxCF8MPN6TYufPcy7fAzCaHx81VSBHi3kFKtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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