SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2413316abc661015e311b72a1310b6f9fd8e2a6434830f8d91c7cdb65995f4a1' 
  AND token = 'EIOQ/aO1P3LT44cBZd+vX+IF0StYR8l5J2Vg0RGqmNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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