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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0168f9091029e60869848de9e0e7c8e11d650e10704f6e40fba39c9bb632f60c' 
  AND token = 'RiFUIBPmyOBKBVsj9EwkM7am7g5TUu2uMgrRWXZk3Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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