SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab48c68267d9e59ebc3fd88ec206db1c2ffab885a95b52ff0eadee48c7c091a' 
  AND token = 'rBIYfVMJGa05gVPGSOvj+0m3dSniVafXZUWHJhdZqBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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