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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d067c7f2802eb440a697a6ad0a5d959972fffa9041a27a039ef509372fdc754' 
  AND token = '7Z7WGDaev6nXUQ48/dJ8enw5UaTy+HbhDB/di/sMyJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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