SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc645ff27e6ff79cbb7ffa85d21eb0c1fc995f31a4996412c5d605df4d4a3d9d' 
  AND token = '61xAEdjCyfYDGQt++73B/oQKnBihfIVJO/QGCgRq1cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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