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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecb0711df7eb05e7dfe5656fd6e060dfbcde742514ef833683e693bacc91572' 
  AND token = '8b/jig4MAGh3hpXtEBkBYynH2PgYs7D6+PKLysSiOvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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