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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67bad27d9600dc57e51563f03649fc704ccb4db6cee0c7bae44743b901c66cc' 
  AND token = 'JNo17j+JTJK2Zxs7xOLsuJw4Zbh5Fp4Z7BlkXlz6Ipk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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