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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164033ea9b018efa01078d78c466e50ea42789ace1382ce22a5c76b5819a73c2' 
  AND token = 'HAQCa+/lF0QPPSo+sg7K3A4YezYh+TpMnxf1ZFykCNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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