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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd24d5fb0e11b1a8e2a03ad04e82be2b63f11bb337fb7f1f8c8fafbb8977aa97' 
  AND token = 'YLztX7dY8nbK/svXLvu/yxaKKlkUjaW/6BPfOneJUHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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