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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7611057054d42065b0b51ef1c49045a3a062b99bf0bb11f216141b9a7c885ce3' 
  AND token = 'CyIkiZg+VBt36bjtY0EXziboZ/2otE6EikFp45l3ADk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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