SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdd68049897c7b313dd6f1225a0f4c6f11075e7de0443c65f501c8a48ad2e6f' 
  AND token = 'Ro3iywXArDRGTZdjpCjlgTnJBJgR3QVahzNkcpGVzFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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