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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c372d3f7248febe88b5557f2195507fb42a4f8839efe6d30b6f0456773a5177' 
  AND token = '3X8drq/eY0n10dHIliJi99Tg6nNiXvWahiidvSCt07s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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