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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb047732da55e61453f4fc6856cdfc4e9d7eb16593a52ad229c2e2d079e893fb' 
  AND token = 'tBfQHvKmrdj/6f2hfX3yo57AvHIzuLl7ol8udAAoWAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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