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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34a21ebd9fb39489cbfbcea2f513448dccfc2b6942c1ab3718a1354853fecea' 
  AND token = 'ZoV+lRCyga1+zqIRh5sQVsyPWbpr3mMJlVZ5ya8KqxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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