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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984e0328a36bf8a9f9d80101ffe830c2934a3120da5b6dee26c85c8593c1d08d' 
  AND token = 'b0chkkR580vBxgnJa+lOA9HrABhH2IGvhUpdCh7b/c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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