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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3d363cc3f60ab405dd4c210fde7b0fbde92454e69c39d00e1d6c5e3d4a68e6' 
  AND token = 'EJjBmWe1HpIDko+hqJF/O708oLkHL0f08sWb83C8754=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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