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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca61459167deec6cc7dd171cf6168e30d3ff83e32fb15068f987d747ba281e63' 
  AND token = 'ciM2pv+Qy48ggqyVSOad65dlJiPn5F9hHx/fjhY8FEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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