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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83adb1cccd7be086ab65eeb69dbd8d05fdc8dbef050048d82c1718c5fe9b01f' 
  AND token = 'nxFLKnm/N8wkM8o1nuF3pbj9OE7pBVnoIbX3XqS1f1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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