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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e6917291527b95346e4915c158238d8d5e3ea9456a107ef121bfa834185ce0' 
  AND token = 'McIMn0AVFCjDy9uHwHy35JEJ7wjaoQyZKqXeRrIs5uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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