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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005f16b9476f1d61e2e096500d4983abac1cd624dcde2dffd325b696af4134d6' 
  AND token = '8rWHVJ6SBKroP9uoUvByEVi6sjoI3y518I5I1R7L8DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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