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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764188cab3ca10f235fb272f3ae9c552b03df7d37f2e180ecb085c586bf7624b' 
  AND token = 'PalI2DW2Tv2zgHvcjERokuml5TyVlL8yinpUm7fQO7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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