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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb82963ff4721f969c5df498d6d064ddf0d563820b9667d118f015a6b586a4fc' 
  AND token = 'lSkYlaw4n+SDGtwiPURafirZuiO1l3mAnvQ29qQtKS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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