SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5554a5b845a20a3765d4a868611dcba13804f831d1dfd2f44cc39b7930813c2a' 
  AND token = '6hWAkrcBQ6PPQwbIYmo1vzFJK+1sDzuKj3yQVPQ2qGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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