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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f0a8a3b5516dba423d07033b7d3c87b22f60e7bb0b1326f20b891ade0c45d5' 
  AND token = '34x1b0UiT+0bbjtIbDuKBBAWEMJpN8bp994u9CDV/iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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