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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76544c4dff5e99609704b6cb96b1d2d6ac042b4e94c183686d08040233029e0' 
  AND token = '/8d3xIZ78K6A31eilerYcrTDI0t7smjmp64TEYtWgYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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