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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168be5ae3a555753a30c7186fff0dacb3a76ff059b9386577507ae8805b36f60' 
  AND token = 'Al7QjiGjKe1nrO7aVarmVw7qajQltURB6l6DmKdhHxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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