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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c32dd4cb847a8dd0955e0fa03b5cba976b9edd885b43e1b4fdbff8898b90deb' 
  AND token = 'CbpSdijMgX2zrvmJ9a6A8IjKTVA4kAgVorUwM5amMko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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