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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d323ab32e9f2598f0cc583c673fdd4f69b4817089b0051424f173ef4daecc7' 
  AND token = 'kpBe5pnPipb9GPs54sxvJz6OysKx9TjZlMXbSGNZL0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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