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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872abab6e9cc7455177e2aa5c67e1e30db33e76fd46b8cc6005064fb99ed0315' 
  AND token = 'KPiuESVSSDZkWiGDN5FDv/fH/QGqERUfBtRS1bgrzAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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