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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ad6d4cd6b1e4f6538f82b186b83f077ec32ec004c6b7a56dd90cf6c7bdaab9' 
  AND token = 'gFDRZMuq+sEACHoVm6+XzS4B6AdmfQRTLKyygfZZUXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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