SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f157d5922fa6fd4f51d6f8ddc480d268ad31c8c207cd0e2b018e3d84776c0de' 
  AND token = 'ENjCpu+/qV2MAUqrhXjn6/3BZoDCHA95aKCi18VFyHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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