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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60f40e3ac427ed2975d375651178cb55c28e1e838a021c765fc3d2936f6a9cd' 
  AND token = 'QlGyueCLWS2siPXQ/ee3GQyPORD+EB/fcZCeAIWUXes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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