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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57248daf725cca4144180fa5ab848ce4c16b3530f7910a4bf7851973c1da42c8' 
  AND token = 'OxBw5CyNgUowr6byxMlC+LFAhnIM0RfVAgXGNudRuSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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