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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9bbb41da85fa221bef9ed52960af1b75f312bf49345300d02a9f65e82d60d7' 
  AND token = '9c6ln25knc0pf9XtBJ2WuurebjBLwcf5glbJmeIEys4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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