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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1cf6a39e5e91ba7c37fc544a26c93b1a67cb0ce46067f85392497c096de704' 
  AND token = 'ClD/8d3RB8qGxtxd5SILWkJRxCnvMd2dTij5+tDvDQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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