SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b26b1130e51a190d413398a8f6e2ace657f7ea1294116d93c5bb3f71689ac23' 
  AND token = 'vPdeosGzIkuJI9x8fEaZ1s+bNCSPsVh2vhYJKPBLBYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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