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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5f878fd517007e3723447041cb9584f412d775f088546d4c9ede1c3c855fc4' 
  AND token = 'BlzV+MLgV9lnzlOv2w5ry72p1ErvvC6rxM3vJZpxWe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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