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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571bf9be2f1ea29631f8f365a573a674fe7d3d96b9a70d6ac7eb7174e834e7a4' 
  AND token = 'VWfN63Xm7mRKwgIyLE1ZYjiC0+RHslc3S/h/kM+Oo1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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