SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6030a56e287ccd20f2c728e571993a1fbf99f6618470b3eedf44bfccd3c217' 
  AND token = 'GPcWJXH+9hJ4j4hgX0ieD+MPE4+6DxyPhUVEuZoszHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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