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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b6d6bc8a181e33b566daf0211f75c0786e1cb7742ec911627fc0436b2c5781' 
  AND token = 'FotM4aokzahwxHnMojyW4n98501LErzxN96UaFDQDjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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