SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8386f3ff231d7b65732073b8966bb68ba71e95339c97006b8ca0a1cdafcc2d72' 
  AND token = 'UBhO7upXJwgll/C+mulRw0TdJihA4Cyv0cz7g44R1RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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