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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f83b21f7ad9bdd06be0a505f54e647a8e3fb12f5bdc9e2a2ef8acb70034d628' 
  AND token = 'EkkcglN0jrPa/u+PZ8aNAQOeiP+Z+FMSVlPfQ/SstDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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