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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb2efd97734a9a648e39169334b01792382cd4e00b9a0c4f442e0b60eb9e510' 
  AND token = 'lk5bbg7hQbJbC72DOJ3Ay2lVnXvr6xRkBzxrCJC3Zhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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