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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdc16c6f6180667ae5b06a99a58ddd51ba9fb4749102238c56be5fddd57fffd' 
  AND token = 'ADGDv+EwwnWIfAWeNOTUTiXpaSsRtGiDzPhzZARxzbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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