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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1194f96d9b891b3d98b97df237ea5877b94f22e7487da0919b99299749a7fb8' 
  AND token = 'Vmxzcjg9DQpfOdJ3FFZVm30Xl92d0A3CdJASRa0e/Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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