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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4baa0ae5a7492cd7d0dca0530d83c7fba8e378c033b60b181cf2e331baa95a4' 
  AND token = 'tbyxKtGVpZaBmF8km5/NZxCOM5pZiSQkbmwPLP4xlN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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