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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e830d303eff901e0da26e3afaf0d3d4dd37f785bf2583a89c593560976f75a6f' 
  AND token = 'vfWBQs7O057zTPjaztdEaWz++FOIbKSmOeSH1XQ6stk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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