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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba33af29c51093ad49600f1c68fdcab491a56e338790fff476984a651f76cee' 
  AND token = 'NpGG5zh/rb6F67jVX5U8RCL7I/u4Hp30nK9qsMnKMRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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