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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6351ef64f96d1b53174717457a85e31a7cde221d5cee398ddccd5d6fed876d6f' 
  AND token = 'maLVAkuDnVg79S0/jtyNLDbJL0wrXCMh2Ekog+waWgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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