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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229a9c93d8d2b4d8803904e870abd5046d326e5b9cdf197cd3fc190002caa17a' 
  AND token = 'Qlz6DmXiHQGBE9fajh/8ZeU2W9l6BeybFJrPE6r+SZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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