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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9783e30cce3b639b3d30e876d3e5d687360d249811aea44a96ec8db30092b20' 
  AND token = 'bndy1h7j8oLRgvyGF/ISSBVmpngsbdbH47ir+IUNYfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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