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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef614c353f4144dae22cdb2d5e1d7e35148b02e703d7b5da1cb3f467f15b6ff0' 
  AND token = 'Uix+N9JAWuCC7l8nP+bLuI3rQPxmv+uhuH3YP17KVzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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