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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e248cbaf7090bba59e544c49796252372a13229df05591a1459fe96d00d2ad' 
  AND token = 'ZOK/1Adnf6iK6/9oSZGIhu5dNcysG6XvWfkPScURHLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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