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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb08ab61b30700846e238a14a844160e42fcf541c010cc91151bb855e1137e3' 
  AND token = 'lu+BfTXoz9Qo1juovSELBm39/wq1cmJtEf88J2rThVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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