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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d8f2bf457db0f7f35cbab9d34d4fc1bf62581424885917b7df96ba023d6eab' 
  AND token = 'I3iMk9F7mOraoq9gZd52G0RVYy8mvvnJ5m2c2h6HBWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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