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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81abefd541d694491f7c2c04cc89d5ca4581590f4d50706c9c6b76c578e55d3a' 
  AND token = 'm9hbxvrweTFKmyJz6kpnYDnASJ4FtpcD3o2s+VKltVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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