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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400170657415bdeac3f6b3539af93307a2720d343b954c4cb64eabc59fe7dbfd' 
  AND token = 'V7UFB5cabzim8rMQhzC3MQ14hoZlwd35JOXQSQRX274=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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