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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0822959dcc7314778ef7f8c380226b4cf280acee27f21701e89faf92504ee2' 
  AND token = '5ENANNwBH9ArZqeI93ouxXEGaMs6W9GHqystHOkm8vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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