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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e491fea02c05ed567ae51fbab7bbf95eb45eacbbd9e6468e2ab12e83bf6de6' 
  AND token = 'FChBCrlPUe3dTodtb93OO4SuHPJQ34i5JAz+A9uMPME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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