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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bc3edda7cf916cfd16537191c8125126d21928227a32ebe5e81aa0c467b593' 
  AND token = 'tSxuUMOfA5eZtfldq+YBURregT9GMRYnqXw1RL0QpFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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