SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19852dc85e784b145ec5e7cc613bbabd119a836f5778d86861c3ce96f8b21717' 
  AND token = 'uLgwMtwLiA+gzJiF+h+Ye55mci+ojQ4KJtlMvIpSKKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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