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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f91a6f91ea333bd5789fbcdbd4d760f69c0287d86b8740f34088f528a0cc2dc' 
  AND token = 'o40Ls5ZqM96HyeOv63C8rfUTVhH75UYEPHB9kGwDgBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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