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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6e7387250611b1d24af95276467dd8207632a1ce9284d23aa15e82fab89136' 
  AND token = 'WeCYp6wp8bs4w5nkczEUdGcvxuwocP0+a0U6cQCwRBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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