SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6bfba4e1818f8d2c3f3c4941baf87ac748ce0e941f57751df4165a947bf7969' 
  AND token = '+n73I+JMsmjrbEJ8TUVCOI/zKoPUPouyj8QWtbkgLz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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