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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28679d45fb2e270318c30c53ecf68579b37c31787fab5a8b8f38ff3ec467f515' 
  AND token = 'ZzH7TkGix1W4KC7WeTLLgJaG6Xk6XKyuA9PYnBib1SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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