SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e04f6860a64773c9bb7202b7b10e44a13f5d65753b62bfcf6889ec451666dd' 
  AND token = 'vNHhg3zJGI/fm6yKwzGf03IW0O+kY9xJQpS3ff/HAho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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