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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafe69f8790ba618683a96f057a58300541e05bf15ef6db95ba70e6e1cf879d3' 
  AND token = 'scQLUu+jQtj17+cd8cGqQ2T4WsUYZ7/GBclCHIfxQOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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